It's a very interesting image, not least because this first look at what everyone hopes will kick-start a new, bright chapter in the franchise contains a subtle yet pointed reminder of the darkest moment in the franchise.
Did you notice the rifle on, um, the Mandalorian's back? We can't see much of it, but thanks to this photo that Favreau posted to Instagram, we know that it's an Amban phase-pulse blaster. Weirdly, this type of blaster doesn't appear at all in the main movies. It's so rare, in fact, that it's only appeared once onscreen before now: in The Star Wars Holiday Special, where we see it was the signature weapon of Boba Fett during those years when his mom was making his costumes.